Abstract
In this chapter we consider two complete SUSY GUTs in four space-time dimensions. In both the SU(5) and SO(10) models the theories include the GUT scale physics of spontaneously breaking the GUT symmetry group, Higgs doublet-triplet splitting and a detailed analysis of gauge coupling unification and nucleon decay. In addition they both include the sector of the theory describing fermion masses and mixing angles which can be tested at the LHC.
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Notes
- 1.
In some cases one may want to include additional low energy states or gauge interactions, but I will not discuss these cases here. For example, the non-minimal supersymmetric standard model [NMSSM] includes an extra SM singlet which might be useful for ameliorating the small hierarchy problem. Also, with the addition of vector-like families it could be made consistent with the recent observed diphoton bump at 750 GeV by ATLAS and CMS.
- 2.
We can identify the field S as the Polonyi field which spontaneously breaks SUSY in a supergravity model. It then also generates all scalar masses. S has U(1) charge, Q S  = 0.
- 3.
This is the U(1) Froggatt-Nielsen mechanism [125].
- 4.
In our convention Dirac mass terms are given by L T mR ∗ and the light neutrinos effective mass matrix is m ν m maj −1 m ν T.
- 5.
Note, this is a choice, since if λ 2 = 0, then cosγ = 1 and h d  = H d .
- 6.
See problem 7.
- 7.
We note, the Z 2 symmetry is violated by some of the effective fermion mass operators independent of the Z 2 charges P 1, 2. It can however be extended to a Z 4 symmetry which is then consistent with all terms.
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Raby, S. (2017). Fermion Masses and Mixing in SUSY GUTs: Predictive Theories. In: Supersymmetric Grand Unified Theories. Lecture Notes in Physics, vol 939. Springer, Cham. https://doi.org/10.1007/978-3-319-55255-2_9
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